Punching machine



March 10, 1964 J. B. GURY m PUNCHING MACHINE 3 Sheets-Sheet 1 Filed Nov. 50. 1961 INVENTOR JOHN B. GURY, 111

Y B CQ-MM'PMMQQ ATTORNEYS March 10, 1964 J. B. GURY m 3,123,912

PUNCHING MACHINE Filed Nov. 50, 1961 5 Sheets-Sheet z illllllllll iglpl za 54 53 u 6la 1 60 57 lllim\ Jl4 IIIIIIA.

, INVENTOR JOHN B- GURY, III BY ATTORNEYS March 10, 1964 GURY m 3,123,912

PUNCHING MACHINE Filed Nov. 30, 1961 3 Sheets-Sheet 3 g o I FIG. 3

I a 32 1| l5 Q IO -27 37 4o 5 23 42 52 5| l4 44 43 22 32 5o FIG. 6

INVENTOR JOHN B- GURY III ATTORNEYS 3 il 65 wwmm- United States Patent M 3,123,912 PUNCHENG MACHINE John B. Gory III, Kirkwood, Mo. J. B. Gury Mfg. 60., 801 N. Skinker, St. Louis 30, Mo.) Filed Nov. 30, 1961, Ser. No. 156,077

Claims. (Cl. 30-362) This inventionrelates generally to improvements in a punching machine, and more particularly to improvements in a machine of this type adapted for use'in forming rows or lines of punched holes or indentations through or on paper or the like to form the outlines of patterns.

Certain features of the assembly are found in US. Patent No. 1,884,668, issued October 25, 1932 to John B. Gury, Jr. and entitled Punching Machine, the present invention constituting an improvement.

It is an important objective to provide a machine that is equipped with improved means for conditioning a switch in an electrical circuit incident to energization and deenergization of a solenoid whereby a cooperating plunger is respectively driven toward the work and subsequently allowed to return to its. initial static position.

Other important advantages are realized in constructing the switch-actuating mechanism so that the switch is conditioned to energize the solenoid in response to the rotation of a wheel mounted to roll along the work to be punched, and so that the switch is conditioned to deenergize the solenoid in response to downward movement of the plunger by operative disengagement from the wheel to allow the component parts of the assembly, namely, the parts of the switch-actuating mechanism and the plunger, to assume their initial static positions for further cyclic action when the wheel is automatically reengaged.

An important object is achieved by the provision of a shaft connected selectively to the wheel so as to rotate therewith, an element reciprocatively mounted to condition the switch, and camming means operatively interconnecting the element with the shaft to move the element in a direction to energize the solenoid upon rotation of the shaft.

Another important objective is afforded by providing a rod that interconnects the reciprocative element and the shaft, the rod being swingable from an initial static position in response to shaft rotation. The rod includes a cam portion that moves the element in a switch-actuating direction upon swinging the rod from its initial position, yet allows the element to move in an opposite direction and causes the shaft to turn to its original static position when the shaft is operatively disengaged from the wheel.

Still another important object is realized by the specific structure of the rod and its arrangement relative to the reciprocative element and a pair of jaws attached to the shaft which provides the desired functional results. The connection of the rod with the shaft is maintained by a slide fit of the rod in the guide slot between the jaws as the shaft is moved axially to effect either connection or disconnection of the means interconnecting the shaft with the wheel.

Yet another important object is achieved by the provision of a lever that selectively engages a member attached to the shaft whereby the shaft can be shifted axially to disconnect the wheel. The operator can then pass the machine freely over the work without causing any punching operation. The shaft is provided with means tending to urge the shaft in a direction to cause connection of the wheel when the lever is released. The machine is then automatically conditioned for punching operation.

An important objective is to provide a punching machine of the present type that is simple and durable in Patented Mar. 10, 1964 construction, economical to manufacture and assemble, highly efiicient in operation, which consists of a minimum of component parts, and which is fully automatic in operation so that it can be advantageously utilized by anyone with only a minimum of instruction.

The foregoing and numerous other objects and advantages of the invention will more clearly appear from the following detailed description of a preferred embodiment, particularly when considered in connection with the accompanying drawings, in which:

FIG. 1 is a perspective view of the punching machine arranged over a workpiece;

FIG. 2 is an enlarged, cross-sectional view as seen along line 2-2 of FIG. :1;

FIG. 3 is a cross-sectional view as seen along line 3-3 of FIG. 2;

FIG. 4 is a cross-sectional view as seen along line 44 of FIG. 3;

FIG. 5 is a cross-sectional view as seen along line 5-5 of FIG. 3, and

FIG. 6 is a cross-sectional view as seen along staggered line '66 of FIG. 4.

Referring now by characters of reference to the drawings, and first to FIG. 3, it will be seen that the punching rnachine includes a body It. having a cavity 11 formed in its upper portion, the cavity 11 being open at the top and being partially defined by a bottom wall 12. Communicating with the cavity 11 through wall 12 is a substantially vertical, stepped bore 13 that opens at the bottom of body 1h. The lower portion of bore 13 is provided with a cylindrical tube 14 the purpose of which will be later explained.

Mountedwithin the cavity 11 is a solenoid generally indicated at 15. Specifically, the base of the solenoid 15 is attached to the bottom wall 12 by a plurality of screws 16.

A plunger referred to at 17 is reciprocatively mounted in the bore 13 of body it and within the solenoid 15. The plunger 17 includes an armature 20 disposed within solenoid 15 and a punch 21 threadedly attached to the lower end of armature 20. It will be noted that the punch 21 slidably interfits the tube 14. The lower end of punch 21 is adapted to perforate or indent the workpiece along which the machine is moved., An inclined shoulder 22 is formed on punch 21 and is adapted to reciprocate within the tube 14. The function of shoulder 22 will be described in detail later.

A compression spring 23 is located about the punch 21 within the bore 13. One end of spring 23 abuts the lower end of armature 2t) while the opposite end abuts the top of tube 14. The spring 23 tends to urge the plunger 17 upwardly to its retracted static position.

The upper end of solenoid l5 and the upper end of armature 2b are enclosed by a cap 24, the cap 24 being secured to body it} by a plurality of screws 25 as is best seen in FIG. 2..

Attached to one side wall of body 10 is a microswitch 26 having a depending, vertically reciprocal button 27. The switch 26 is operatively connected in an electrical circuit with the solenoid 15 to control energization and de-energization. A source of electrical power is supplied to the electrical circuit of the punching machine through a pair of electrical connector prongs 30 mounted immediately above the switch 26 on a casing 31. The casing 31 is attached to body It? by a plurality of screws 32 and is adapted to cover the switch 26 and the switch-actuating mechanism.

Formed integrally with body 10' and projecting from one side within the casing 31 is a boss 33 located below the switch as. A guideway 34 is provided vertically through the boss 53, the guideway 34 being adapted to receive reciprocatively an element 35. The element includes at its upper end an adjusting screw 36 that is adapted to engage the switch-actuating button 27. The boss 33 is provided with a seat 37 at the lower end of guideway 34.

A rod 40 including a camming portion 4-1 of substantially frusto-conical configuration is disposed within the guideway 34. The camming portion 41 is supported on the seat 57 to determined an initial or static position of rod 46, yet mounting the rod 4t) for swinging movement on either side of such position. The upper flat surface of camming portion 41 engages the underside of element 35.

Because of the specific shape of camming portion 41 and the gravitational forces on element 35, there is a tendency for rod 4-0 to move to its initial static position. However, there is usually a spring (not shown) within the micro-switch 26 that tends to urge the button 27 downwardly to its circuit-open position. Because the button 27 engages the element 35, the element 35 is urged downwardly under the same spring pressure and thereby tends to maintain the rod 49 in such initial static position.

The rod 4e also includes a shank 42 that extends downwardly out of the guideway 34 for access and connection to mechanism for swinging the rod 49 from its static position.

Rotatively and reciprocatively mounted in body 10 is a transverse shaft 43. One end of shaft 43 extends into the casing 31 below rod 46. A member 44, the shape of which is more clearly shown in FIG. 4, is drivingly attached to this end of shaft 43. It is seen that the member 44 is substantially circular and is provided with a circular recess 45 opening at its upper periphery to form a guide slot 46 between a pair of spaced jaws 47. The

lower end of rod shank 42 interfits in slot 46 between jaws 47. The slot 4-6 extends in a direction parallel to the axis of shaft 43.

Upon rotation of shaft 43, the jaws 67 will swing the rod 46 to one side or the other of its initial vertical position depending upon the direction of shaft rotation. As the rod 40 is swung from its initial position, the camming portion 41 raises the element 35 in guideway 34 and thereby conditions the switch 26 so as to energize the solenoid 15.

The opposite end of shaft 43 engages a ball 50 that is held in an aperture communicating with the interior of bore 13 below the inclined shoulder 22 on punch 21.

A spring 51 is located about shaft 43, one end of spring 51 engaging a fixed bearing 49 while the opposite end engages a collar 52 formed on shaft 43, the spring 51 tending to urge the shaft 43 axially in a direction so that the shaft urges the ball 56 into the bore 13 and into the path of travel of the shoulder 22.

A wheel 53 is located closely adjacent the punch 21 and is adapted to engage and roll along the work to be punched. The wheel 53 is rotatively mounted on an axle 54 that is fixed to body 16. Secured to the hub of wheel 53 is a ratchet or gear 55 so as to be rotated therewith. Cooperating with the ratchet 55 is a pawl or segmented gear 56 that is drivingly attached to shaft 43.

Upon rotation of wheel 53, the ratchet 55 acting through the pawl 56 rotates the shaft 43. As the punch 21 descends, the inclined shoulder 22 engages the ball 50 and urges the shaft 43 axially in a direction so that the pawl 56 is operatively disengaged from the ratchet 55. As will be explained, after the punch 22 is raised, the spring 51 tends to urge the shaft 43 axially in a direction to reengage the pawl 56 with ratchet 55.

Attached to the bottom of body 16 is a substantially horizontal base plate 57 adapted to rest on the work as the machine is moved for perforating operation. The base plate 57 is provided with a central opening 60 through which the wheel 53 extends and through which the punch 21 reciprocates during punching operation. It will be noted that the wheel 53 extends only slightly through the opening 69 below the bottom surface of base plate 57 sufficiently so that the wheel 53 engages and moves along the work, yet allows the base plate 57 to hold the work flat in the area of perforation.

As is best seen in FIG. 1, the base plate 57 is provided with a wire 61 that extends over the opening 66 in alignment with the vertical axis of the punch 21, yet parallel to the plane of rotation of wheel 53. The wire 61 indicates the line along which the perforations are made.

At times it is desirable to move the machine over the work without causing any perforations. To provide this result, a mechanism is provided for manually shifting the shaft 43 axially to disengage the pawl 56 from ratchet 55. From FIG. 6 it is seen that a lever 62 is pivoted by pin 63 to the body 10-. One end of lever 63 is provided with a grip portion 64 curved to accommodate the operators finger and to facilitate manipulation of the lever 62. The opposite end 65 of lever 62 is disposed between the body 1t and the shaft member 44. A spring 66 interconnects the lever 62 with the body 10 and tends to urge the lever 62 in a direction about pin 63 to its inoperative position as shown in FIG. 6.

When the lever 62 is moved in the direction indicated by the arrow in FIG. 6, the lever end 65 engages the shaft member 44 and pushes the shaft 43 axially in the direction of the arrow so that the pawl 56 operatively disengages from the ratchet 55. As long as the lever 62 is maintained in this pivoted position by the operator, the wheel 53 can be moved over the work without causing energization of the solenoid 15 or operation of plunger 17.

To facilitate movement of the machine along the work, a handle 67 is attached to body 10. It will be noted that lever 62 extends closely adjacent the handle 67 so that the operator may conveniently pivot the lever 62 while maintaining his grip on the handle 67.

A light fixture 70 is carried by body :10 and is disposed so as to reflect the light directly through the opening 60 and onto the work in the area of perforation.

It is thought that the operation and functional advantages of the punching machine have become fully apparent from the foregoing detailed description of parts, but for completeness of disclosure a cycle of operation will be briefly described.

As the wheel 53 rolls on the work along the line to be perforated, in either a fore or aft direction, the wheel 53 drives the ratchet 55 which in turn rotates the shaft 43 through the pawl 56. As the shaft 43 is rotated, the jaws 47 swing the rod 40 to an inclined position from its vertical initial static position so that the camming portion 41 raises the element 35 against the switch button 27, whereby the switch 26 is conditioned to energize solenoid 15. When the solenoid 15 is energized, the plunger 17 is driven downwardly in a direction toward the work. The punch 21 strikes the work and makes a hole or indentation.

As the punch 21 moves downwardly, the inclined shoulder 22 engages the ball 50 and cams the ball 50 outwardly of the tube 14. The ball 59 pushes the shaft 43 axially outwardly for a sufficient distance to disengage the pawl 56 from ratchet 55. Because the guide slot 46 between jaws 47 is of sufficient length, the rod shank 42 slides along the guide slot to permit this axial shifting of shaft 43, yet maintains operative engagement with member 44.

The downward pressure on element 35 and the inherent tendency of cam portion 41 to assume its seated position, causes the rod 40 to swing back to its vertical initial position. As the rod 40 swings, the interengagement of rod shank 4 2 with the jaws 47 turns the shaft 43 to its initial static position. When the element 35 lowers, the switch 26 is conditioned so as to deenergize solenoid 15. At that time the plunger 15 is immediately raised by spring 23.

After the punch 21 is raised sufficiently so that the inclined shoulder 22 moves above the ball 50, spring 51 urges the shaft 43 axially in a direction so that operative reengagement of pawl 56 with ratchet 55 is realized. The

machine is then conditioned for another cycle of operation.

Although the invention has been described by making detailed reference to a single preferred embodiment, such detail is to be understood in an instructive, rather than in any restrictive sense, many variants being possible within the scope of the claims hereunto appended.

I claim as my invention:

1. In a punching machine:

(a) a plunger,

(11) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger to its initial position upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(h) an element reciprocatively mounted to actuate the switch,

(i) camming means operatively interconnecting said element with said shaft to move the element in a direction to condition the switch and energize the solenoid upon rotation of said shaft,

(j) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said element moving in a direction to condition the switch to deenergize the solenoid acting through said camming means to turn the shaft to its initial position, and

(It) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

2. In a punching machine:

(a) a plunger,

(b) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger to its initial position upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means selectively, interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(h) an element reciprocatively mounted to actuate the switch,

(1') a rod mounted for swhlging movement, the rod having a cam portion that engages said element to reciprocate said element upon swinging movement,

(j) means on said shaft engaging said rod to cause swinging of said rod upon rotation of said shaft, the cam portion moving the element in a direction to condition the switch and energize said solenoid,

(1:) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means' interconnecting the shaft with said wheel upon movement of the plunger toward the zork, said cam portion acting through said rod to turn the shaft to its initial position, and

(l) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

3. In a punching machine:

(a) a plunger,

(b) a solenoid for driving said plunger against the Work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched.

(f) a shaft,

(g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(h) a guideway including a seat,

(i) an element reciprocatively mounted in said guideway to actuate the switch,

(j) a rod having a cam portion supported on said seat and mounted for swinging movement, the cam portion engaging said element to reciprocate said element in said guideway upon swinging of said rod,

(k) means on said shaft engaging said rod to swing said rod upon rotation of said shaft so that the cam portion moves the element in a direction to condition the switch to energize said solenoid,

(1) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to dis engage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said element moving in the other direction so as to condition the switch to deenergize the solenoid and acting through said rod to turn the shaft to its initial position, and

(m) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

4. In a punching machine:

(a) a plunger,

(12) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be'punched,

(f) a shaft,

(g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(h) a guideway including a seat,

(1') an element reciprocatively mounted in said guideway to condition said switch,

(j) a rod having a frusto-conical cam portion located in said guideway and supported on said seat and having a reduced shank extending from said guideway,

(k) the cam portion having its top engaging said element, the rod being mounted for swinging movement on either side of an initial position, the cam portion reciprocating said element in said guideway upon swinging of said rod,

(1) means on said shaft engaging the shank to cause swinging of said rod from its initial position upon rotation of said shaft, the cam portion moving said element in a direction to condition the switch to energize the solenoid,

(111) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the meaus interconnecting the shaft with said wheel upon movement of the plunger toward the work, the element moving in a direction to deenergize the solenoid and said rod turning the shaft to its initial position, and

(it) means connected to said shaft to move the shaft axially to cause operative reengagernent of the means interconnecting the shaft and wheel upon return of the plunger.

5. In a punching machine:

(a) a plunger,

(b) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(11) a pair of jaws rotatable with said shaft,

(i) means including a cam operatively connected to said jaws and to said switch and actuated by said jaws upon rotation of said shaft to condition said switch so as to energize said solenoid,

(j) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, the cam conditioning the switch to deenergize the solenoid and acting through said jaws to turn the shaft to its initial position, and

(k) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and the Wheel upon return of the plunger.

6. In a punching machine:

(a) aplunger,

(b) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

((1) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(/1) a pair of jaws rotatable with said shaft,

(1') an element reciprocatively mounted to condition said switch,

(j) camming means operatively interconnecting said element with the jaws to move the element in a direction to actuate the switch and energize said solenoid upon rotation of said shaft,

(k) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said element moving in a direction to condition the switch to deenergize the solenoid and acting through said camming means and jaws to turn the shaft to its initial position, and

(1) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

7. In apunching machine:

(a) aplunger,

(b) a solenoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(11) an element reciprocatively mounted to'condition the switch,

(1') a rod mounted for swinging movement, the rod having a cam portion that engages said element to reciprocate said element upon swinging movement,

(j) a pair of jaws rotatable with said shaft, said jaws providing a guide slot extending substantially in the direction of the shaft axis, said rod being received in said guide slot so that said jaws swing said rod upon rotation of said shaft, the cam engaging the element to actuate the switch and energize the solenoid,

(k) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said rod being movable in said guide slot to maintain operative connection between the rod and jaws, said cam portion causing movement of the element to condition the switch to deenergize the solenoid and acting through said rod and jaws to turn the shaft to its initial position, and

(1) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

8. In a punching machine:

(a) aplunger,

(b) a soelnoid for driving said plunger against the work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means selectively interconnecting the shaft with said wheel so as to rotate the shaft in response to rotation of said wheel,

(11) a guideway including a seat,

(i) an element reciprocatively mounted in said guideway for conditioning said switch,

(j) a rod having a cam portion supported on said seat and mounted for swinging movement, the cam portion engaging said element to reciprocate said element in said guideway upon swinging of said rod,

(k) a pair of jaws rotatable with said shaft, said rod extending between said jaws, said jaws swinging said rod upon rotation of said shaft, the cam portion moving the element in a direction to condition the switch so as to energize said solenoid,

(1) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said rod being movable loosely between said jaws upon axial movement of the shaft, said cam portion acting through said element to condition the switch to deenergize the solenoid and acting through said rod and jaws to turn the shaft to its initial position, and I (111) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger.

9. In a punching machine:

(a) a plunger,

(b) a solenoid for driving said plunger against the Work upon energization,

(c) a switch operatively connected to said solenoid,

(d) means connected to said plunger for returning the plunger upon deenergization of said solenoid,

(e) a wheel mounted to engage and roll along the work to be punched,

(f) a shaft,

(g) means selectively interconnecting the shaft with said Wheel so as to rotate the shaft in response to rotation of said wheel,

(11) a member including a pair of spaced jaws drivingly attached to said shaft for rotation therewith,

(i) a guideway including a seat,

(j) an element reciprocatively mounted in said guideway to condition the switch,

(k) a rod having a frusto-conical cam portion located in said guideway and a reduced shank extending from said guideway, a flat shoulder between the shank and cam portion supported on said seat to provide an initial position of said rod, the cam portion having a flat top engaging said element, the rod being mounted for swinging movement on either side of the initial position, the cam portion reciprocating said element in said guideway upon swinging of said rod,

(2) said shank being disposed between said jaws so that said jaws swing the rod upon rotation of said shaft so that said cam portion moves the element in a direction to condition the switch and energize the solenoid,

(in) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work,

(n) means tending to urge the rod back to its initial position so that the cam portion acts through said element to condition the switch to deenergize the solenoid and acts through said rod and jaws to turn the shaft to its initial position, and

() means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger, said shank being movable freely in a direction of said shaft axis between said jaws upon axial movement of said shaft.

10. In a punching machine:

(a) a body,

(b) a plunger reciprocatively mounted in said body,

(c) a solenoid for driving said plunger against the work upon energization,

(d) a switch operatively connected to said solenoid to control energization and deenergization,

(2) means connected to said plunger for returning the plunger to its initial position upon deenergization of said solenoid,

(f) a wheel mounted to engage and roll along the work to be punched,

(g) a shaft mounted on said body for oscillation and reciprocation,

(h) means interconnecting the shaft with said wheels 'so as to rotate the shaft in response to rotation of said wheel,

(1') said body being provided with a guideway,

(i) an element reciprocatively mounted in said guide- Way and adapted to condition said switch,

(k) a rod having a frusto-conical cam portion located in said guideway and a relatively reduced shank extending from said guideway, a flat shoulder between the shank and cam portion supported on said seat and defining an initial position of said rod, the cam portion having a flat top engaging said reciprocating element, the rod being mounted for swinging movement on either side of its initial position so that the cam portion reciprocates said element,

(1) a member drivingly attached to said shaft for rotation therewith, said member including a pair of spaced jaws having a guide slot therebetween, said guide slot extending in the direction of the shaft axis,

(m said rod shank being located in said guide slot between said jaws so that said jaws swing said rod from its initial position upon rotation of said shaft, said cam portion moving said element in a direction to condition the switch to energize said solenoid,

(n) means acting on said element tending to urge said rod back to its initial position,

(0) means operatively interconnecting the shaft and said plunger to move the shaft axially so as to disengage the means interconnecting the shaft with said wheel upon movement of the plunger toward the work, said rod shank being movable freely along said guide slot upon axial movement of the shaft, said means moving the element in a direction to condition the switch to deenergize the solenoid and acting through said rod and jaws to turn the shaft to its initial position, and

(p) means connected to said shaft to move the shaft axially to cause operative reengagement of the means interconnecting the shaft and wheel upon return of the plunger, said rod shank being movable freely along the guide slot between the jaws upon such axial movement.

References Cited in the file of this patent UNITED STATES PATENTS 1,884,668 Gury Oct. 25, 1932 

1. IN A PUNCHING MACHINE: (A) A PLUNGER, (B) A SOLENOID FOR DRIVING SAID PLUNGER AGAINST THE WORK UPON ENERGIZATION, (C) A SWITCH OPERATIVELY CONNECTED TO SAID SOLENOID, (D) MEANS CONNECTED TO SAID PLUNGER FOR RETURNING THE PLUNGER TO ITS INITIAL POSITION UPON DEENERGIZATION OF SAID SOLENOID, (E) A WHEEL MOUNTED TO ENGAGE AND ROLL ALONG THE WORK TO BE PUNCHED, (F) A SHAFT, (G) MEANS SELECTIVELY INTERCONNECTING THE SHAFT WITH SAID WHEEL SO AS TO ROTATE THE SHAFT IN RESPONSE TO ROTATION OF SAID WHEEL, (H) AN ELEMENT RECIPROCATIVELY MOUNTED TO ACTUATE THE SWITCH, (I) CAMMING MEANS OPERATIVELY INTERCONNECTING SAID ELEMENT WITH SAID SHAFT TO MOVE THE ELEMENT IN A DIRECTION TO CONDITION THE SWITCH AND ENERGIZE THE SOLENOID UPON ROTATION OF SAID SHAFT, (J) MEANS OPERATIVELY INTERCONNECTING THE SHAFT AND SAID PLUNGER TO MOVE THE SHAFT AXIALLY SO AS TO DISENGAGE THE MEANS INTERCONNECTING THE SHAFT WITH SAID WHEEL UPON MOVEMENT OF THE PLUNGER TOWARD THE WORK, SAID ELEMENT MOVING IN A DIRECTION TO CONDITION THE SWITCH TO DEENERGIZE THE SOLENOID ACTING THROUGH SAID CAMMING MEANS TO TURN THE SHAFT TO ITS INITIAL POSITION, AND (K) MEANS CONNECTED TO SAID SHAFT TO MOVE THE SHAFT AXIALLY TO CAUSE OPERATIVE REENGAGEMENT OF THE MEANS INTERCONNECTING THE SHAFT AND WHEEL UPON RETURN OF THE PLUNGER. 